HYDRAULIC PRESSURE CONTROL ELECTROVALVE AND ITS USE IN BRAKING CIRCUITS

摘要

PCT No. PCT/FR95/01205 Sec. 371 Date Oct. 17, 1995 Sec. 102(e) Date Oct. 17, 1995 PCT Filed Sep. 20, 1995 PCT Pub. No. WO96/11828 PCT Pub. Date Apr. 25, 1996A proportional solenoid valve for regulating pressure of fluid supplied to a system. The solenoid valve has high-pressure inlet (1), a low-pressure inlet (2) and an outlet (3) through which fluid under controlled pressure is supplied to the system. The solenoid valve has a body (4) with bore (5) therein for retaining a regulating slide valve (9). The regulating slide valve (9) is subjected to a pressure acting on a cross-section (S), to the force of a spring (10) and to a force exerted by an electromagnet (14,15). Movement of the slide valve brings about a communication between the high-pressure inlet (1) and the outlet (3) and communication between the low-pressure inlet (2) and the outlet (3) as a function of a control valve (16). The control valve (16) is located between the high-pressure inlet (1) and the outlet (3) and the high-pressure inlet (1) and low-pressure inlet (2) are isolated from one another by the slice valve (9) as long as said control valve is not open.